/////////////////////////////////////////////////////////////////////////////
// Original code from libhdfs3. Copyright (c) 2013 - 2014, Pivotal Inc.
// All rights reserved. Author: Zhanwei Wang
/////////////////////////////////////////////////////////////////////////////
//  Modifications by Kumo Inc.
// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//



#pragma once

#include <stdint.h>
#include <turbo/crypto/crc32c.h>
#define CHECKSUM_TYPE_SIZE 1
#define CHECKSUM_BYTES_PER_CHECKSUM_SIZE 4
#define CHECKSUM_TYPE_CRC32C 2

namespace Hdfs::Internal {
    /**
     * An abstract base CRC class.
     */
    class Checksum {
    public:
        Checksum() = default;

        Checksum(uint32_t checksum) : _value(checksum) {
        }

        /**
         * Destroy the instance.
         */
        ~Checksum() = default;

        /**
         * @return Returns the current checksum value.
         */
        uint32_t getValue() const { return static_cast<uint32_t>(_value); }

        /**
         * Resets the checksum to its initial value.
         */
        void reset() {
            _value = turbo::CRC32C{};
        }

        /**
         * Updates the current checksum with the specified array of bytes.
         * @param b The buffer of data.
         * @param len The buffer length.
         */
        void update(const void *b, int len);

    protected:
        turbo::CRC32C _value;
    };
} // namespace Hdfs::Internal
